I've been using my own telegram -> ai bot and its very interesting to see what others do with the similar interface.
I have not thought about adding memory log of all current things and feeding it into the context I'll try it out.
Mine is a simple stateless thing that captures messages, voice memos and creates task entries in my org mode file with actionable items. I only feed current date to the context.
Its pretty amusing to see how it sometimes adds a little bit of its own personality to simple tasks, for example if one of my tasks are phrased as a question it will often try to answer the question in the task description.